Forensic acoustic proof of SECOND shooter in the Las Vegas massacre

In essence, because of the differences in the speed of sound vs. the
speed of the bullets from a known cartridge (.223 Remington, in this
case), the time lag between the last bullet hitting the pavement and the
last audible report of the rifle muzzle can be used to very accurately
calculate the range of the shooter.

More importantly, when the audio from the Las Vegas shooting is
analyzed, it reveals TWO shooters operating at the same time, not just
one shooter. Shooter #1 is operating at 425 – 475 yards, which is
consistent with the Mandalay Bay hotel, but shooter #2 is operating at
approximately 250 – 270 yards.